Furnace-grate and fire-bar.



R. CAMPBELL.

FURNACE GRATE AND FIRE'BAB. APPLIOATION I'ILEDYHOV. 13, 1905.

902, 1 3 5 Patented Oct. 27, 1908.

FIG. I.

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1n: mmms PETER! can vlsnmarou, n. c.

UNITED STATES PATENT OFFICE.

RICHARD CAMPBELL, OF LIVERPOOL, ENGLAND.

FURNACE-GRATE AND FIRE-BAR.

To all whom it may concern:

Be it known that I, RICHARD CAMPBELL, a subject of the King of GreatBritain, residing at Liverpool, in the county of Lancaster, in theKingdom of England, engineer, have invented certain new and usefulImprovements in Furnace-Grates and F ire-Bars, for which application hasbeen made in Great Britain, No. 16,608, dated the 23rd day of July,1906.

This invention has for its object certain improvements connected withfurnace grates and fire-bars.

In furnace grates which We have manufactured hitherto, the removal ofthe clinker and ash from the grate has been effected by rocking the barsup and down so as to shake them, this being effected by mechanism inproximity to the grate, but this necessitated the front of the furnaceor the ashpit being opened every time the bars were shaken, which, inforced draft furnaces especially, was a disadvantage.

In the accompanying drawings, Figure 1 is a sectional view of a furnaceshowing my invention partly in section; Fig. 2 a longitudinal sectionthrough the furnace; Fig. 8 a sectional plan.

Now the present invention is designed to avoid this defect. The gratebars A are supported in any suitable manner, and are not connectedtogether but each is free and can be shaken vertically withoutdisturbing any of the others. Beneath the bars at their forward end, andtransversely under the grate, is a hollow horizontal shaft B whichissuitably journaled in bearings C and extends through the side of thefurnace shell E to the outside of the furnace or boiler where it isprovided with an arm or lever D. This hollow shaft B is provided with alongitudinal slot F, and inside the hollow shaft B I provide a screwedshaft G. On this screwed shaft Gr is mounted the screwed boss of aforked lever H, the arm of which projects through the longitudinal slotF in the hollow tube. The end of the screwed shaft G is furnished with ahandle or lever I so that it can be rotated, and thus by rotating thishandle I the forked arm H mounted on the screw, can be traversedlongitudinally, the slot in the hollow shaft permitting of this. Thus byturning the screwed shaft, the forked lever can be slid along the widthof the furnace grate and its arm H made to engage in a born orprojection K on any Specification of Letters Patent.

Application filed November 13, 1906.

Patented Oct. 27, 1908.

Serial No. 343,275. i

one of the fire-bars. The pitch of the screw G is such that a singlerotation, or two rotations, or otherwise of the handle I, will bring theforked lever out of engagement with the horn K of one fire-bar A, andinto engagement with the horn on the adjacent fire-bar.

hen it is desired to clinker the furnace, the stoker turns the handle Iof the screwed shaft G so as to move the forked arm II longitudinallyuntil its fork arrives at the grate bar that requires to be moved, andengages the projection or horn. He then oscillates or turns the lever orhandle D on the hollow shaft B. This turns not only the hollow shaft B,but also the forked lever II and the screwed shaft G, and as the forwardend of the forked arm H engages the horn K on the grate-bar A, the saidbar is moved or shaken as required. Should the grate-bar be wedged inits raised position, the stoker may force it down by again moving thehandle D of the hollow shaft the other way, thus causing the forked armto force the latter into position again. Any individual gratebar canthus be raised or lowered, or shaken up and down, by operating the handlever at the end of the hollow shaft. Each bar however can only beshaken when the forked arm comes into engagement with the horn on eachbar and therefore it is bound to have imparted to it a direct verticalpush or pull. Further the shaking of the bars can be effected withoutopening the front of the furnace L or ash pit M. The shafts B and GWhere they pass at N through the sides of the furnace or boiler, can beprovided with stuffing boxes. Each shaft can be made in a single length,or in two lengths placed in line. The dotted lines in Fig. 2 show a barin its raised position, and the full lines show the bar in its loweredposition.

I declare that what I claim is 1. In a furnace-grate, the combination ofa series of independent bars; a tube provided at one end with a lever bywhich it can be oscillated, said tube having a longitudinal slot formedtherein; a screw shaft mounted within the tube; an arm mounted upon thescrew shaft and projecting through the longitudinal slot in the tube;and means for turning said screw shaft so as to traverse the armlongitudinally and bring it into engagement with one or another of thegratebars.

2. In a furnace-grate, the combination of a series of independentgrate-bars; a screw shaft; an outwa-rdly-projecting arm provided with athreaded boss which is mounted on the shaft, the outer end of the armbeing adapted to engage a projection on the gratebars; means for turningthe shaft so as to traverse the arm longitudinally; and a slotted tubesurrounding the screw shaft with the arm projecting through the slot, sothat by oscillating said tube it will impart an osformed upon the armand mounted on the screw shaft; means at the outer end of the screwshaft for turning the same; and means located without the furnace forshaking or oscillating the hollow shaft.

d. In a furnace-grate the combination of a series of independent bars;an arm normally in engagement with one or another of said bars; meansfor shifting the arm laterally to bring it into engagement with one oranother of the bars and to hold it in such relation; and means forrocking the arm, whereby the bars may be independently shaken.

In witness whereof, I have hereunto signed my name this 2d day of Nov.1906, in the presence of two subscribing witnesses.

RICHARD CAMPBELL.

Vitnesses G. C. DYMOND, Y. S. SHILLING'roN.

